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The MakerGear Mosaic 3D Printer - Part VI: The Build Platform 

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The MakerGear Mosaic 3D 

Printer - Part VI: The Build 


Written By: Sean Michael Ragan 


Hex/ Allen wrench (1) 


Spring (3) 

Leveling platform (1) 

with countersunk mounting holes and 

large slot 

Bolt (3) 

Heating element (1) 

Build surface (1) 

Binder clip (4) 


This is the sixth of eight guides in a series documenting my build of MakerGear's Mosaic 
desktop FDM/FFF 3D printer kit. 

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Page 1 of 5 

The MakerGear Mosaic 3D Printer - Part VI: The Build Platform 

the frame , the Y-axis, the X-axis , the Z-axis,the extruder ,the build platform the electronics, and the first print . 

This part covers assembly of the build platform, which consists of installing and adjusting 
the leveling platform, mounting the build surface and heating element, and making the 
associated electrical connections. 

Step 1 — Mount the leveling plate 

• Slide the mounting plate all the way to the front of the printer, so you have room to work. 

• Position each of three 7mm coil springs over one of the three threaded holes in the 
mounting plate. 

• Hang the three flathead M4x14mm bolts through the countersunk holes in the leveling 
plate, then guide them through the springs and into the mounting holes as you lower the 
leveling plate into place. It's a bit tricky, but not too difficult, even for one person. 

• Hold the leveling plate in position with one hand, and use a 2.5mm hex wrench, in your free 
hand, to start each of the three bolts into the corresponding threaded hole in the mounting 
plate. You need only engage one or two threads of each bolt, for now, just to keep 
everything in place. 

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The MakerGear Mosaic 3D Printer - Part VI: The Build Platform 

Step 2 — Prepare for leveling 

• Use a 2.5mm hex wrench to tighten the mounting bolts until the springs underneath are 
about "halfway" compressed. 

• Temporarily remove the nylon Z-height stop adjusting bolt, and set it aside. 

• Turn the white octagonal knob to raise the Z-platform assembly as high as it will go, until it 
butts up against either the extruder nozzle or the Z-height stop switch. 

Step 3 — Level the build platform 

• Though this operation is described as "leveling," in fact, the name refers to 
"leveling" the platform with respect to the extruder nozzle, and not with respect to 
the Earth's gravity. 

• Adjust the position of the X- and Y-axes as necessary to check the distances between the 
nozzle tip and each of the plate's four corners. 

• Adjust the tightness of the three leveling plate mounting bolts, as needed, to equalize the 
distance between the nozzle tip and the plate at each corner. 

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The MakerGear Mosaic 3D Printer - Part VI: The Build Platform 

Step 4 — Reset the build platform 

• When the leveling operation is complete, turn the white octagonal knob to lower the Z- 
platform back to a midway position along the Z-axis. 

• Using your fingers, reinstall the nylon Z-height stop bolt in the threaded brass fitting in the 

Step 5 — Install heating element 

• Position the heating element PCB as shown, with the power and temperature sensor leads 
positioned to exit through the slot in the leveling plate. 

• Set the aluminum build surface plate over the heating element. Note that the surface is 
designed to be removable for maintenance and cleaning. 

• Secure the build surface and the heater in place, on the leveling plate, with a binder clip in 
each corner, as shown. 

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The MakerGear Mosaic 3D Printer - Part VI: The Build Platform 

Step 6 — Electrical connections 

• Connect the thermistor leads to the Z-platform wiring harness via the snap-lock Molex 
connection, as shown. This connection is self-indexing, and cannot be plugged in the 
wrong way. 

• Connect the heating element power cord to the Z-platform wiring harness by the red 
polarized two-prong connector, as shown. Again, this connection cannot be plugged in 

Next up: the electronics ! 

This document was last generated on 201 2-1 0-31 11 :34:05 PM. 

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